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import { mergeHandlers } from 'calypso/state/action-watchers/utils';
import { bypassDataLayer } from '../utils';
import { middleware } from '../wpcom-api-middleware';
describe( 'WordPress.com API Middleware', () => {
let next;
let store;
beforeEach( () => {
next = jest.fn();
store = {
dispatch: jest.fn(),
getState: jest.fn(),
replaceReducers: jest.fn(),
subscribe: jest.fn(),
};
store.getState.mockReturnValue( Object.create( null ) );
} );
test( 'should pass along actions without corresponding handlers', () => {
const handlers = Object.create( null );
const action = { type: 'UNSUPPORTED_ACTION' };
middleware( ( actionType ) => handlers[ actionType ] )( store )( next )( action );
expect( store.dispatch ).not.toHaveBeenCalled();
expect( next ).toHaveBeenCalledWith( action );
} );
test( 'should pass along local actions untouched', () => {
const adder = jest.fn();
const handlers = mergeHandlers( {
[ 'ADD' ]: [ adder ],
} );
const action = bypassDataLayer( { type: 'ADD' } );
middleware( ( actionType ) => handlers[ actionType ] )( store )( next )( action );
expect( next ).toHaveBeenCalledWith( action );
expect( adder ).not.toHaveBeenCalled();
} );
test( 'should pass along non-local actions with non data-layer meta', () => {
const adder = jest.fn();
const handlers = mergeHandlers( {
[ 'ADD' ]: [ adder ],
} );
const action = { type: 'ADD', meta: { semigroup: true } };
middleware( ( actionType ) => handlers[ actionType ] )( store )( next )( action );
expect( next ).toHaveBeenCalledTimes( 1 );
expect( adder ).toHaveBeenCalledWith( store, action );
} );
test( 'should pass non-local actions with data-layer meta but no bypass', () => {
const adder = jest.fn();
const handlers = mergeHandlers( {
[ 'ADD' ]: [ adder ],
} );
const action = { type: 'ADD', meta: { dataLayer: { groupoid: 42 } } };
middleware( ( actionType ) => handlers[ actionType ] )( store )( next )( action );
expect( next ).toHaveBeenCalledTimes( 1 );
expect( adder ).toHaveBeenCalledWith( store, action );
} );
test( 'should intercept actions in appropriate handler', () => {
const adder = jest.fn();
const handlers = mergeHandlers( {
[ 'ADD' ]: [ adder ],
} );
const action = { type: 'ADD' };
middleware( ( actionType ) => handlers[ actionType ] )( store )( next )( action );
expect( next ).not.toHaveBeenCalledWith( action );
expect( adder ).toHaveBeenCalledWith( store, action );
} );
test( 'should allow continuing the action down the chain', () => {
const adder = jest.fn( () => {} );
const handlers = mergeHandlers( {
[ 'ADD' ]: [ adder ],
} );
const action = { type: 'ADD' };
middleware( ( actionType ) => handlers[ actionType ] )( store )( next )( action );
expect( next ).toHaveBeenCalledTimes( 1 );
expect( next ).toHaveBeenCalledWith( bypassDataLayer( action ) );
expect( adder ).toHaveBeenCalledWith( store, action );
} );
test( 'should call all given handlers (same list)', () => {
const adder = jest.fn();
const doubler = jest.fn();
const handlers = mergeHandlers( {
[ 'MATHS' ]: [ adder, doubler ],
} );
const action = { type: 'MATHS' };
middleware( ( actionType ) => handlers[ actionType ] )( store )( next )( action );
expect( adder ).toHaveBeenCalledWith( store, action );
expect( doubler ).toHaveBeenCalledWith( store, action );
expect( next ).toHaveBeenCalledTimes( 1 );
} );
test( 'should call all given handlers (different lists)', () => {
const adder = jest.fn();
const doubler = jest.fn();
const handlers = mergeHandlers(
{
[ 'MATHS' ]: [ adder ],
},
{
[ 'MATHS' ]: [ doubler ],
}
);
const action = { type: 'MATHS' };
middleware( ( actionType ) => handlers[ actionType ] )( store )( next )( action );
expect( adder ).toHaveBeenCalledWith( store, action );
expect( doubler ).toHaveBeenCalledWith( store, action );
expect( next ).toHaveBeenCalledTimes( 1 );
} );
describe( 'network response', () => {
let adder;
let handlers;
const action = { type: 'ADD' };
beforeEach( () => {
adder = jest.fn();
handlers = mergeHandlers( {
[ 'ADD' ]: [ adder ],
} );
} );
test( 'should not pass along actions for a network response that contains headers', () => {
const meta = { dataLayer: { headers: {} } };
middleware( ( actionType ) => handlers[ actionType ] )( store )( next )( {
...action,
meta,
} );
expect( next ).not.toHaveBeenCalled();
} );
test( 'should not pass along actions for a network response that contains data', () => {
const meta = { dataLayer: { data: {} } };
middleware( ( actionType ) => handlers[ actionType ] )( store )( next )( {
...action,
meta,
} );
expect( next ).not.toHaveBeenCalled();
} );
test( 'should not pass along actions for a network response that contains an error', () => {
const meta = { dataLayer: { error: {} } };
middleware( ( actionType ) => handlers[ actionType ] )( store )( next )( {
...action,
meta,
} );
expect( next ).not.toHaveBeenCalled();
} );
test( 'should not pass along actions for a network response that contains a progress report', () => {
const meta = { dataLayer: { progress: { total: 1, loaded: 1 } } };
middleware( ( actionType ) => handlers[ actionType ] )( store )( next )( {
...action,
meta,
} );
expect( next ).not.toHaveBeenCalled();
} );
} );
} );
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